CVE-2019-1010091

XSS in TinyMCE

setup: function(editor) {
  editor.on('PreInit', function() {
    editor.parser.addNodeFilter('#cdata', function(nodes) {
      for (var i = 0; i < nodes.length; i++) {
        nodes[i].remove();
      }
    });
  });
}

A cross-site scripting (XSS) vulnerability was discovered in: the core parser and media plugin. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor via the clipboard or APIs. This impacts all users who are using TinyMCE 4.9.9 or lower and TinyMCE 5.2.1 or lower.

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

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This vulnerability has been patched in TinyMCE 4.9.10 and 5.2.2 by improved HTML parsing and sanitization logic.

1. What is CVE-2019-1010091? CVE-2019-1010091 is a medium-severity cross-site scripting (XSS) vulnerability in tinymce (npm), affecting versions < 4.9.10. It is fixed in 4.9.10, 5.2.2. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. Which versions of tinymce are affected by CVE-2019-1010091? tinymce (npm) versions < 4.9.10 is affected.
3. Is there a fix for CVE-2019-1010091? Yes. CVE-2019-1010091 is fixed in 4.9.10, 5.2.2. Upgrade to this version or later.
4. Is CVE-2019-1010091 exploitable, and should I be worried? Whether CVE-2019-1010091 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
5. What actually determines whether CVE-2019-1010091 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
6. How do I fix CVE-2019-1010091?
   • Upgrade tinymce to 4.9.10 or later
   • Upgrade tinymce to 5.2.2 or later

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